Ascalaph Graphics

Graphical windows

Ascalaph
shows molecular models in separate windows.
Each window has two cameras, which allow the model to be simultaneously
visualized from two sides and in different graphic modes. The subwindow
can be opened by dragging the splitter in the right corner of each graphical
window.

Pressing space bar centers and resets the scale of the current
camera. Pressing Esc cancels the selection and picking.

Mouse control

The left mouse button always controls the camera. Without modifier keys,
it rotates the camera around the model. If the Shift key is pressed,
the camera comes closer or moves away from the model; when the Ctrl
key is pressed, the camera moves along the model.

The effect of the right mouse button depends on which panels are open.
By default, it selects an atom or a bond. Double-clicking inverts the selection.
When both buttons are pressed, the "left mouse actions" are applied
to the selected molecules rather than to the camera. Accordingly, the atomic
coordinates rather than the camera are shifted.

If the free drawing panel is active, the right mouse button creates
atoms and bonds (upon stretching). When the Ctrl key is pressed,
the atom or bond is deleted.

If the geometric panel is active, the left button picking applies to
the last two, three, or four atoms (rather than to a single one) depending on
whether the distance, angle, or torsion angle is in focus.

Picking, selection, and freezing

Clicking on an atom or bond with the left mouse button slightly changes their
color and a brief info about the picked object appears in the status
bar.

Clicking with the right mouse button selects the object.
Double-clicking with the right button inverts the selection.

Pressing the Esc key cancels the Picking and
Selection.

Graphic styles

Ascalaph Graphics supports several graphic styles.
CPK is the basic style. It gives the most realistic picture of
the molecule in space.

The Wire frame style is convenient for large molecules, particularly,
for proteins. Drawing is very fast for this style.

The Stick style is largely for presentations.

The Ball and Stick style is convenient for molecule construction
and editing, since atoms and bonds are clearly visible. In addition,
the bond color reflects their order.